Subtract 18/27 from 25/70, Solve 25/70

Subtract 18/27 from 25/70

25/70 - 18/27 is -13/42.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 27 is 1890

Next, find the equivalent fraction of both fractional numbers with denominator 1890
For the 1st fraction, since 70 × 27 = 1890,
25/70 = 25 × 27/70 × 27 = 675/1890
Likewise, for the 2nd fraction, since 27 × 70 = 1890,
18/27 = 18 × 70/27 × 70 = 1260/1890
Subtract the two like fractions:
675/1890 - 1260/1890 = 675 - 1260/1890 = -585/1890
After reducing the fraction, the answer is -13/42

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